Web based generator of monochromatic images. (demo: https://monochroman.draho.cz)
It generates black & white (just two colors, not grayscale) images.
It can be used for monochromatis displays (e-paper / e-ink) which are capable of producing only 2 colors.
Also for artistic purposes.
Several types of dithering filters:
- fixed treshold
- ordered filters
- simple cluttered/disparsed 3×3
- Bayer 2x2, 4×4, 8×8
- error diffustion filters
- Floyd-Steinberg
- Atkinson
- Jarvis-Judice-Ninke
- Sierra 3
- Stucky
Aditional features:
- Add noise to prevent digital artifacts from occuring
- Adjust brightness and contrast of intermediate grayscale image
- Narrow range of depth in which error diffusion is applyed
(zoom page 200% or 300% to better se the differences)
raw
| Fixed treshold | cluttered 3×3 | Bayer 2×2 | Bayer 4×4 | Bayer 8×8 |
|---|---|---|---|---|
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| Floyd-Steinberg | Atkinson | Jarvis-Judice-Ninke | Sierra 3 | Stucky |
|---|---|---|---|---|
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with added noise and reduced range
| Fixed treshold | Bayer 2×2 | Floyd-Steinberg | Stucky |
|---|---|---|---|
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adjusted brightness and contrast
| On 2.9" waveshare e-paper display | |
|---|---|
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- Can open files of common image formats (png, jpeg and whatewer si compatible with html5 canvas)
- Can save to png or co custom bitmap format.
- Can POST bitmap over http to somewhere.
Outputed bitmap format is very simple. First 4 bytes define width and height (Big endian), rest is bitmap itself - one bit per pixel.
Eg.: (file with 8×8 chess pattern)
bin:
00000000 00001000 > width
00000000 00001000 > height
01010101 10101010 \
01010101 10101010 \ pixels
01010101 10101010 / 0=Black, 1=White
01010101 10101010 /
hex:
00 08 00 08 AA 55 AA 55 AA 55 AA 55
Edit BACKEND_URL constant on line 6 to enable pushing bitmap to your http server to which send button will be sending bitmap, where you can do whatewer you want with it
TODO - commit example of own backend
